Help with rental property calculator report

[David Craft]

I am new to real estate investing. I've create a few reports with the rental property calculator and have received very high ROIs (e.g., 22%) and cash flow projections ($900 plus per month in net income). I utilized the same cost assumptions that Brandon Turner utilized when he demonstrated the tool on the "How to Make 2020 Your Best Year in Real Estate" webinar.  I want to see if anybody has suggestions on what changes I should make to get more realistic projections on my property analysis. I appreciate any advice that can be offered on this matter.